Conjectured to be the largest prime that can be represented uniquely as the sum of three squares (1^2 + 9^2 + 9^2). Note that squares are allowed to be zero. [Noe]

163 is the least number k such that decimal representation of 1/k has
period of length 81. It is one of a few exceptions to the rule that
k=3^(n+2) is the least number with 1/k having period 3^n. [Noe]